Amplifier for telephone receivers



n/ lll reference being had therein Patented Mar. 2, 1926.

A oFFlcE,

JOHN LAYTON GUERRANT, OF FRESNO, CALIFORNIA.

AMPLIFIER FOR TELEPHONE RECEVERS.

Application filed January 31, 1924. Serial No. 689,697.

To all LU/mm, t 'may concern:

Be itknown that l, JOHN L.- GUnunANT, a citizen et United States, residing at 835 University Ave., Fresno, in the County of Fresno and State of California, have invented certain new and useful Improvevments in Amplifiers lor Telephone Receivers, of which the 'following isa specification,

to the accompanying drawing. f

The present invention relates to amplifiers for telephone receivers, and `aims to provide a simple and inexpensive device of that kind capable ol receiving and holding a telephone receiver so as to amplify the sounds, the device being intended especially as a loud speaker `t'or radio receiving sets. i i

Another object el the invention is the provision oit such an amplifying device having provision for encasing or housing the telephonereceiver and connecting a horn-therewith, so that the sounds will be magnified with a soft, smooth tone, and without the sounds being metallic or harsh. f

A further'object is the provision of novel means for obtaining a tight connection between the horn and receiver, in order that the sounds are transmitted from the receiver through. the horn with good effect.

With the foregoing and other objects in view, which `will be apparent as the description proceeds, the invention resides in the construction and arrangement of parts as hereinafter described and claimed, it being understood that changes can be made within the scope of what is claimed, without departing from the spirit of the invention.

The invention is illustrated in the accompanying drawing, wherein the figure is a median section of the device, portions being shown in elevation.

The amplifier is intended for use with various telephone receivers, especially those o1 the single type. The receiver 7 shown includes a case having the dished or concaved side or cap 8 formed centrally with the perforations or apertures 9 through which the sound waves pass from the enclosedV diaphragm, and 10 indicates the wires or conductors to which the receiver is connected as usual. Y

In carrying out the invention, there is provided a case or box 11 of wood, rubber, libre or other suitable. material, which has the chamber 12, and a plug or cap 13 is screw-threaded into the mouth of the case 11 to close the chan'iber 12, and said cap or closure has the flange 14 in order thatthe case and cap can be screwed together conveniently by band. The cap can be of any suitable material, the same as the case 11, and a cushion 15 of rubber, felt or other resilient material is vdisposed on the inner surface oit the cap 13 to support the receiver 7 in the case with a cushioning action.V

The case 11 is provided withv a` screwthreaded aperture or opening 16 opposite to the mouth of the case and cap 13, into which is screw-tlneaded the neck 17 of the horn 18. The neck 17 has a shank 19 projecting from the case 11 tor convenience in screwing said neck into and out of the case, and the horn 18 may be ot' paper, wood, fibre, metal or other suitable n'iaterial. The horn may be curved, as shown in full lines in thel drawing, or may be of any other desired form.

A tubular throat member 2O of rubber, :l'elt or .other cushioning material is litted in vthe'neck 17 of the horn, and has an annular bead ,o-r gasket 21 at its inner endabutting the inner end of the neck 17 and adapted to abut the receiver 7 around the apertures 9, when the neck 17 is screwed into the case 11. The opening 22 of the throat member 2() is preferably iestricted between the ends of said member and increases in diameter to the ends of said member, and the member 20 being of cushioning material will soften the sounds and avoid raspy noises such as produced by hard objects having vibratory or rubbing contact with one another.

The rim ot the case 11 has a slot 23 for receiving the wires or cord 10 or the receiver, when the receiver is inserted into the case, said slot 23 extending to the mouth of the case.

When the cap 1-3 is unscrewed from the case, the receiver can be readily placed in or removed from the case, and when placed Vin the case, the receiver will rest on the cushionl 15 of the cap when the cap is screwed into the case. The neck 17 of the horn is then screwed into the case until the bead or gasket 21 is compressed tightly between the neck 17 and receiver around the apertures 9, and the pressure will also compress the cushion 15 between the receiver and cap, whereby the receiver is 4cushioned from opposite sides. The bead 21 surrounding the apertures 9 will compel the sound waves to pass through the throat member 20 into and through the horn 18, and the sounds are thus amplified with a clear tone of increased volume.

The device is capable of inexpensive manufacture, the case 1l, cap 13 and neck 17 being; readily 'turned from W'ood other- Wise cheapl)7 manufactured, and any suitable horn can be used. The present device also enables the receiver lto be used in the usual Way b v placing` it against the ear, inasmuch as the receiver can be fquickly removed by simply unscrewin'g` the cap 13 from the lcase il.

Having' thus described the invention, what' is claimed 'as new is 1-. An amplifier comprising'a case, a 'telephone receiver therein including;` fa case having a sound aperture, a horn connected with the Iifrst named ca se in registration i'vith said aperture, a resilient gasket between said horn and Second n'alned case and surrounding said aperture. the first named case having `a portion opposite to the horn against which the second-named clase seatsi 'and said port-ion and horn being adjustable relatively to one another for clamping the second named case lbetween sai'd Igasket and portion.

2. An amplifier comprising' a'case for fenclosinga telephone receiver and 'having' a portion 'aga-inst which said receiver is seatable, a horn having a neck screw-threaded into the case opposite to said portion, and a gasket carried by said neck beyond the inner 'end thereof to vcnitact with the receiver, with the receiver clamped between said gasket and portion.

3. An amplifier comprising la case for enclosing a telephone receiver, a horn having a neck engaging the case, and a resilient gasket beyond the inner end of the neck arranged to contact with the receiver and to be compressed between said neck and receiver, the case having' adjustable means opposite to said 'gasket for clamping' the re ceiver between said gasket and means.

4. An an'iplillier comprising a case ior enclosing a telephone receiver, a screw 'cap for the 'ca-se, a horn having a neck screwtfhre'ade'd into the ca'se opposite to said cap, and a gasket carried by the inner end por tion of said neck to contact with said receiver, with the receiver 'clamped between said 'gasket and cap.

5. An 'an'lpli'tier comprising a case for enclosing a telephone receive-r, a detachable 4cap for the case, a cushion carried by 'said 'cap to Contact with the receiver, a Ih'orn having its neck len'gac'ed to the case 'opposite to said cap, and cus ironing means to be disposed b'etween 'said horn and receiver- 6. An 'amplifier comprising a case for enclosing' a telephone receiver, a screw cap for the case, a cushion carri-ed :by said c'ap to cont-act with the receiver, a lrorn having a neck 'ehgagingthe -case opposite to said cap, and a ,gasket 'carried by said neck to Contact with the receiver.

' In testimony whereof I hereunto affix my signature.

JOHN LAYTON GU ERRANT. 

